Deputy Prime Minister Michael McCormack says a preference "deal" between the Nationals and Pauline Hanson's One Nation "just makes sense" because the parties' policies closely align and it will help the Coalition win the election.

The Nationals leader also warned his predecessor and rival, Barnaby Joyce, to concentrate on winning his seat of New England after dominating national headlines early in the campaign courtesy of the water buyback scandal.

Nationals leader Michael McCormack with the party's official wooden wombat, on the campaign trail in Mackay.Credit:Dominic Lorrimer

Senator Hanson has announced she will give preferential treatment to Nationals MPs and certain Liberals on how-to-vote cards, giving the government a critical boost in key marginal seats, while in Queensland the Liberal National Party is directing preferences to One Nation above Labor and the Greens in half a dozen seats.

Mr McCormack said preferences were a matter for the party's executive but "if it's a deal that benefits the National Party … then I'm certainly not against it".

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"The fact is [Pauline Hanson] acknowledges that our policies are more closely aligned with the interests and wants of her voters than the Greens or Labor," he told The Sydney Morning Herald and The Age in Mackay on Monday.

"She, like us, is concerned that the Greens want to close down mining by 2030. She, like us, is concerned about Labor’s land lockout laws under the guise of native vegetation laws. She, like us, is concerned about regional Queensland. So it just makes sense that she has put us above other candidates."

Mr McCormack said the same applied in reverse – that One Nation's policies aligned more closely with the desires of Coalition voters – which was why his party was giving preferences to One Nation above Labor in key Queensland seats.

He acknowledged some statements by One Nation people "in the past, indeed in the recent past", were unpalatable.

"But at the end of the day, we're in an election," Mr McCormack said. "You can’t be altruistic and then after May 18 just be shouting from the sidelines and be in opposition and wishing you had done something else. We want to win.”

While Coalition preferences in the lower house hardly ever come into play, minor parties' support for the Coalition over Labor is likely to be crucial in close contests such as Capricornia, Flynn, Dickson and Petrie in Queensland - where minor parties will net a strong primary vote but won’t be contenders to win the seat.

A stoush over the preferences of Clive Palmer's United Australia Party escalated on Monday, with Labor senator Anthony Chisholm denying he sought a deal with Mr Palmer on behalf of the party before relations soured.

Labor has lashed the Coalition's preference deal with Mr Palmer and criticised the billionaire's failure to pay out entitlements to workers laid off from his Queensland Nickel refinery after its collapse in 2016.

Asked if he needed to rein in Mr Joyce, Mr McCormack said: "Barnaby’s gonna concentrate on winning New England - that’s what I want him to, that’s what he wants himself to do, that’s what he needs to do ... I am sure Barnaby is going to be sticking to that."

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Responding to criticism of his own performance as Nationals leader - including a YouGov poll that showed most voters had not seen him in this campaign – Mr McCormack said he did not worry about popularity contests.

"For those people who actually have seen me out and about, I had the least number who were unimpressed by what they saw. So I’ll take that as a tick," he said.

"I’m not somebody who's always going to shout from the rooftops about what I've achieved or what I've done. The fact is I’ve been talking about the things that matter to people – that's jobs, that's infrastructure, that's a better future for the regions."

Mr McCormack would not discuss whether he would throw open the Nationals leadership if the Coalition loses the May 18 election. But he committed to serving a full term as the member for Riverina if re-elected.